Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Ni Bond Coat on Adhesive Properties of Fe Coating Thermal Sprayed on Al Substrate

Ni 본드코팅이 Al 기지에 고온 용사 코팅된 Fe 코팅층의 접합특성에 미치는 영향

  • Kwon, Eui-Pyo (Carbon & Light Materials Application R&D Group, Korea Institute of Industrial Technology) ;
  • Kim, Dae-Young (Carbon & Light Materials Application R&D Group, Korea Institute of Industrial Technology) ;
  • Lee, Jong-Kweon (Product development division, Sewon Hardfacing Co., Ltd.)
  • 권의표 (한국생산기술연구원 탄소경량소재응용그룹) ;
  • 김대영 (한국생산기술연구원 탄소경량소재응용그룹) ;
  • 이종권 ((주)세원하드페이싱 제품개발부)
  • Received : 2016.06.30
  • Accepted : 2016.09.02
  • Published : 2016.10.27
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Abstract

The influence of NiCrAlY bond coating on the adhesion properties of an Fe thermal coating sprayed on an Al substrate was investigated. By applying a bond coat, an adhesion strength of 21MPa was obtained, which was higher than the 15.5MPa strength of the coating without the bond coat. Formation of cracks at the interface of the bond coat and the Al substrate was suppressed by applying the bond coat. Microstructural analysis of the coating interface using EBSD and TEM indicated that the dominant bonding mechanism was mechanical interlocking. Mechanical interlocking without crack defects in the coating interface may improve the adhesion strength of the coating. In conclusion, the use of an NiCrAlY bond coat is an effective method of improving the adhesion properties of thermal sprayed Fe coatings on Al substrates.

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